Thread-cutting machine



A. STRUKELI.. THREAD CUTTING MACHINE.

APPLICATION FILED DEC. 4| I9I9. 1,354,078.

3 SHEETS-SHEET I.

Pmndsepn 28,1920.

A. STRUKELL. THREAD CUTTING MACHINE.

APPLICATION FILED DEC. 4. 1919. 1,354,078. Patente s sHEETs-sHEET 2.

dsept. 28,1920.

A. STRUKELL. THREAD CUTTING MACHINE.

APPLICATION FILED DEC. 4, 1919.

Patented Sept. 28, 1920.

3 SHEETS-SHEET 3 UNITED STATESv PATENT OFFICE.

ANTONY STRUKELL, OF BROOKLYN, NEWvYORK, ASSIGNOR OF ONE-FOURTH TO HARRY B. DODS, 0F BROOKLYN, NEW YORK.

THREAD-CUTTING MACHINE.

Application led December 4, 1919.

To aZZ whom t 'may concern:

Be it known that I, ANTONY STRUKELL, a citizen of Austria, residing at Brooklyn, Kings county, State of New York, have invented certain new and useful Improvements in ThreadCutting Machines, of which the following is a full, clear, and exact description.

This invention relates to improvements in thread cutting machines. One of the objects of this invention is to provide a machine to automatically thread fountain pen barrels to receive a cap. My improved device is designed to automatically cut threads at the open end of a fountain pen'barrel; that is to say, the end which receives the pen section and cap to cover the pen section.

To completely carry out the object of my' invention, I have arranged the device to automatically stop after a predetermined number of threads have been cut. My improved automatic thread cutting machine will greatly reduce the cost of manufacture of fountain pen barrels, and will, furthermore, produce a clean cut thread, either single or multiple, as may be desired.

I will now proceed to describe my invention in detail, the novel features of which will be pointed out in the appended claims, reference being had to the accompanying drawings, forming part hereof, wherein Figure 1 is a top plan view of an embodi-e ment of my invention;

Fig. 2 is an enlarged fragmentary sectional view, illustrating the die, a portion of a fountain pen barrel, and supporting spindle therefor;

Fig. 3 is a face view of the die;

Fig. 4 is a side elevation of the device;

Fig. 5 is an enlarged longitudinal sectional view of a portion of the machine, the die being shown in elevation;

Fig. 6 is an enlarged cross-sectional view, the section being taken on a line 6-6 in Fig. 4;

Fig. 7 is a fragmentary sectional view of the spindle and therein contained threaded sleeve for operating the barrel spindle; and

Fig. 8 is an enlarged elevation of a fountain pen barrel, broken away, a cap being illustrated in section.

While my improved device may be embodied in various forms, I have herein illustrated a simple construction consisting of a standard member 9, which supports a ro- Speccation of Letters Patent.

Patented Sept. 28, 1920.

serial No. 342,363.

tatable hollow spindle 10, said spindle being supported by the bearing members 11. The bearing members 11 may be provided with bushings 12, made of phospho-bronze or other suitable material. The spindle 10 has tightly secured thereto by means of a setscrew 14, a belt-pulley 15, by which means, and a belt 16, the pulley 15 is rotated. On each side of the pulley 15 I place a loose pulley 17, that is to say, on each side of the pulley 15 I place a loose pulley, one of which, in this instance the one on the left, is engaged by a cross belt 18, for the purpose of reversing the spindle 10, after said spindle has been caused to cease rotating by the shifting of the belt 16 from the tight pulley 15 to the loose pulley 17, at the right of the said pulley 15 (see dotted lines in Fig. 1).

ne end of the spindle 10 carries a die 19 provided with cutters or tools 20, 21 and 22. The cutters referred to are held between a cap 23 and the body of the die, by means of set-screws 24, the cap being held in the body of the die by screws 25. The die 19 carries a tapered shank 26, which fits the tapered counter bore 27 of the spindle 10. The die is frictionally held by the spindle 10 and is removable therefrom. As can be seen in Fig. 2, the cutters 20 to 22, inclusive, project into a counter-bore 28 in the die 19, said counter bore being deep enough. to enable the cutters to cut threads upon the adjacent end of a fountain pen barrel, indicated by 29, to the desired extent. The counter-bore 28 will be deep enough to permit of the cutting of threads to an extent greater than will be needed for the application of a cap, but it is within the scope of my invention to provide a die having a counter-bore, such as 28, deep enough to cut threads to any desired extent. The open end 30 of the cap 29 is supported by a longitudinally movable rod 31, having a conical end 32, upon which the adjacent end of the barrel is placed. Intermediate its ends, the rod 31 is provided with threads 32 to engage a threaded sleeve 33 (see Figs. 5 and 7 secured within the hollow spindle 10 by set screws 34. The sleeve 33 will be removable as well as the rod or barrel support 31, for the purpose of installing a rod and sleeve having threads of a different pitch. The rod 31, at the end opposite to the pointed end, will be secured to head 35 is carried by longitudinally movable rods 37, sli'dably supported by bearings 38, projecting from the bearing members 11. The opposite end of each rod 3,7 is secured to a cross-head'r39, carrying a chuck 40.

'Y The chuck 40 is slidably retained by the cross-head 39, and maybe movedtoward or away from the die 19in order to mount a barrel for cutting or to remove same after ithas been cut. The chuck 40 carries a pin 41, which engages a slot 42 in the hub 43 of rthe-cross-head 39, when said chuck is pushed all the way in to engage the end 43 of a barrel to be ont. The pin 42 prevents Vthe chuck from rotating while the barrel is being cut.Y The end 43 of the'barrel 29 will tightly fit the socket 44 in the chuck 40, and will not rotate therein.

-Asll desire to cause the lcutters to cease "operating after a predetermined number of threadsV have beencut, l provide the rods 37 vith adjustable stops, one of said stops being indicated by 45, the other by 46. As can be seenV in Fig. 1, the vstop 46 is in the nature of a sleeve, which carries a fork 41,'engaging the belt 16 for the tight pulley 15. The

stopsare secured iii adi usted positions by sei;

i screws 48. To shiftd'the cross-belt 1 8,- l1

provide a pivoted fork 49, operable (in this instance) by means of a pedal 50. The belt '18 will normally engage the loosepnlley 17 latzthe left of the pulley 15, and will Shiftedto the pulley 15 when a reversal of lthe spindleilO is desired.

To maintain the .rod'or barrel support 31 in 'its extreme position,to the left, in order to keep the threads "32 on saidrodout lof mesh withfthe threads the-sleeve V33, whenl the machine is not in operation' to cut threads, 1 employ aspi'ing 51, which connects'the stop 46 and `one of vthebearings Y38 (see Fig. 1). It may hereA be lstatedthat cutting tools 2O to `22, inclusive,'are removable, in order -that they may be sharpened. In Vorder to position' the cutwith the'outer surface offthe wall of the barrel'29, I may employ a'ny'sui'table tool,V

suchfor instanceas tapered lug,as a tool 'forthis ypiirpose'fhas -no bearing uponk the operation of 'theunach-ine other than' that of 'setting the tools, ya descriptionv thereof is thought to besuperfluous.

"Iwill now proceed to describe the opera- Y tion'of the machine.

To cut'threads upon a fountain pen bartion 'of thearrow"52 (Fig. 1), farenough tofpermit ofthe insertion of the 'closed end of the barrel Einto the socket 44. lAfter the barrel has been placed in the socket '44, the Vchuck 40 and the 'barrel will be movedii'i `the direction of thea-rrow53, to cause the openf end of the barrel to engage the conical end 32 lof the support or rod 31, as indicated in Fig. 2. During the above described operation, the spindle 10 may be in opera- Ytion under the influence of the belt 16.

After the barrel has 4been placed upon the rod 31, as above described, the pin 41 will bein engagement with the slot 42, therefore,

vthe chuck 40 and barrel 29 will be held "against rotation.V rlhe next step in the 0peration of threading the barrel will be to forcethe carriage A, which is made up of the rods 37, Vcross-heads 3 5 and 39, and the rod-31,in the direction of the arrow 54, to cause the threads' 32 onv the rod 31, vto engage the bushing 33,. It will be remembered that the threads on the rod 31 are kept out of engagement with the threads 'of the bushing 33, excepting while the threads are being cut. After the threads onthe rod have been caused to engage the bushing 33, whichwill be iii motion or rotating, the rod 31 will bey drawn in the direction of the arrow 54, Fig. 1, therebycausing thecai'- riage A tomove in a corresponding direction. 'A 'continued movement in the direc- -t'ion indicated will cause the barrel 29 to become engaged by the cutters 20 to 22, inclusive,vand a continued rotation of the die, which isc-carried by the rotatingwspindle, willv cut threads in the Ybarrel`f29. The carriage A will continue to move totheiright, in this instance, until the stops v45 and 46 `Contact with the bearing members A38. Dur- `ingthemovement of the carriagein the direction Y above indicated, the belt 1,6 will be caused to travel from the tight pulley 15 toward the loose pulley 17 at the right of Vsaid pulley 15,. VAbout the time that the stops 45 and 46 contact with the bearing members 38, the belt 16 will have cleared the tight pulley 15, and the spindle 10 will stop. To reverse the spindle 10 to cause the barrel- 29 to move toward the left, the pedal 50 will be depressed causing the cross-belt 18 to moveonto the tight pulley 15,aft'er which the spindle 10 will be reversed and cause the va corresponding amount; hence, whenever stop 46 comes in' contact with Vthe bearing 38, the belt 16 will always clear the tight pulley 15, and the danger Vof having the stopyora stop, coming in Contact with its abutment before -the drivingbelt leaves the driving pulley is obviated Should the-'stop come in contact with its abutment before the driving belt leaves the driving pulley, the

threads would be destroyed; that is to say, the threads at the end of the threaded por tion of the barrel. To thread a cap, a chuck (not shown) would be substituted for the die 19, and a tap placed in the chuck. In this instance the cap would be held by the chuck 40, the samel as a barrel.

l/Vhat I claim and desire to secure by Letters Patent is 1. In a thread cutting machine, a longitudinally movable carrier to receive the article to be threaded, a chuck in line there.

with to cooperate with said carrier to hold the said article while the threads are being cut, said chuck being movable with said carrier, rotatable cutting tools adjacent the carrier, means to rotate the cutting tools, and means to automatically cause the tools to cease operating after a predetermined number of threads havebeen cut.

2. In a thread cutting machine, a longi tudin ally movable carrier to receive the article to be threaded, a chuck in line therewith to cooperate with said carrier to hold the said article while the threads are being cut, said chuck being movable with said carrier, rotatable cutting tools adjacent the carrier, means to rotate the cutting tools, means to automatically cause the tools to cease operating after a predetermined number of threads have been cut, and means to move the carrier in a direction opposite to the direction imparted thereto while the threads are being cut, after the said threads have been cut.

3. In a thread cutting device, a carrier, a support therefor, threads carried thereby, a threaded element to engage the threads on said carrier, means to rotate the threaded element to move said carrier longitudinally of its support, a rotatable cutting tool adjacent the carrier, and a chuck coperating with said carrier to support the article to be threaded.

4l. In a thread cutting device, alongitudinally movable carriage, supports therefor, a carrier supported at one end by one end of said carriage, a chuck supported by the carriage at the other end thereof, said chuck alining with said carrier, a rotatable cutting tool adjacent said carrier arranged to thread articles held by said chuck and carrier, and means to move the carriage longitudinally of its supports, to cause the article to be threaded to engage said tool.

5. In a thread cutting machine, a rotatable hollow spindle, a threaded bushing within the spindle, a longitudinally movable carrier within the spindle projecting from one end thereof, and arranged to receive one end of the article to be threaded, threads carried b v the carriage, to be engaged by the threaded bushing, a die carried by said hollow spindle located adjacent the projecting end of said carrier and surrounding same,

means to rotate the spindle, and manual means to move the carrier to cause the threads thereon to engage the said threaded bushing. l

6. In a thread cutting machine, a rotatable hollow spindle, a threaded bushing within the spindle, a longitudinally movable carrier witnin the spindle projecting from one end thereof, and arranged to receive one end of the article to be threaded, threads carried by the carriage, to be engaged by the threaded bushing, a die carried by said hollow spindle located adjacent the projecting end of said carrier and surrounding same, means to rotate the spindle, manual means to move the carrier to cause the threads thereon to engage the said threaded bushing, and means to cause the hollow spindle to cease rotating after a predetermined number of threads have been cut.

'7. In a thread cutting machine, a rotatable spindle, a tight pulley carried thereby, a loose pulley at each side of the tight pulley, a belt movable from the tight pulley to one of the loose pulleys and vice versa, a cross-belt normally engaging the other loose pulley and movable to engage the tight pulley, a threaded bushing within the hollow spindle, a longitudinally movable carrier within the spindle and projecting from one end thereof, threads carried by the carrier to be engaged by the threaded bushing, said carrier being arranged to retain the article to be threaded, a die carried by the spindle located adjacent the projecting end of said carrier, means to arrest the movement of the carrier after a predetermined number of threads have been cut, means to shift the belt from the tight pulley to the cooperating loose pulley during the cutting of the threads to cause the hollow spindle to cease rotating when said carrier comes to rest, and means to shift the cross-'belt from its loose pulley to the tight pulley to reverse the movement of the hollow spindle.

8. A device for cutting threads in the outer surface of tubular articles, a longitudinally movable carrier having a conical end to be inserted into one end of the hollow article, a chuck movable with said carrier to receive the opposite end of said article, a rotatable element to actuate or move said carrier and cooperating chuck, a rotatable die arranged to cut threads in the wallof said tubular article, during the longitudinal movement thereof, and means to arrest the movement of said carrier after a predetermined number of threads have been cut.

Signed at New York city, N. Y., this 2nd day of December, 1919.

ANTONY STRKELL.

Witnesses:

EDWARD A. JARvIs, MAURICE BLOCK. 

